Handover Modeling of Multiple States of Mobile Node in a Five Node Network Model

Abstract

need to be assessed to identify the one which produces best results in terms of successful handover. The performance measuring algorithms should be independent of the technology used in the handover algorithm. The performance can be based on number of successful handovers or number of incorrect decisions. Hence it necessitates a common algorithm to measure the performance. There are some performance measurement algorithms available in [4, 5]. These algorithms do not have robustness in terms of analytical approach and mathematical formulation. However this gap was filled by a new approach [6] based on the probability models and is independent of the technology used for the handover. The approach is known as wrong decision probability and is based on number of incorrect decisions made for hand over. Wrong decision probability approach is based on the criteria like bandwidth availability, signal strength, movement of the mobile node etc. Authors in [6] used a two network model which was academic in nature. However, in practice the number of networks are more than two, many cases it is five. Suresh et. al. developed a five network model to measure the performance based on wrong decision probability [7]. The wrong decision probability was computed based on available bandwidth. Other algorithms that evaluate the performance can be found in [9-21]. In all the algorithms that the authors developed in [7], the mobile nodes were assumed to be in good health. However in practice not all the mobile nodes in the network are cooperative, but can be in other states like failed state, selfish state or malicious state [20, 21]. In this work, a five node network model is developed to consider all the four states, namely, cooperative state, failed state, selfish state and malicious state in calculating the handover probability, unnecessary handover probability, missing handover probability and wrong decision probability based on the criteria of available bandwidth. Next section presents the analytical models for the UHP, HP and WDP. Section III has the general algorithms which are used in calculating the probabilities and section IV presents the simulated results.